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Finding the Fourth Proportional to 884.90, 1,328.70 and 679.70

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Solution

The fourth proportional to 884.90, 1,328.70 and 679.70 is: 1,020.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.90 : 1,328.70 = 679.70 : x
  2. Step 2: Convert to fraction form
    884.90/1,328.70 = 679.70/x
  3. Step 3: Cross multiply
    884.90x = 1,328.70 × 679.70
  4. Step 4: Simplify right side
    884.90x = 903,117.39
  5. Step 5: Solve for x
    x = 903,117.39/884.90
  6. Step 6: Final answer
    x = 1,020.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.